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ive got a 93 wt swb sierra with 31s and a 1litre transfer case
want to get speedo right 4 engineer found a place called marks adaptors at vic send up ratio box 4 $170 thing is not sure what ratio
ihad a mate drive in front on cruise control at 70 my speedo read 50 so i thought 40% but then did tyre size conversion and it equals to 14.84% what the could the transfer case be th e problem any help would be greatly appreiciated
hahaah i had this same issue - search posts by me (alien) with speedo in the subject... pretty sure its called "all about the speedo".
Anyways - my 5.14tcase is almost perfectly bringing my gearing back to stock... so when a speedo guy tested it by RPM on the cable, it was correct, even though it was out by around 20%... the solution was adding about 20mm to the spring on the speedo. We then checked by GPS and its all good now, however a ratio box will say its way out of whack cos of the gearing =)
there's a local guy in newy who those speedo boxes to make it all work right. but i deleted his name and number when i got rid of the zook, lol. if you ring around a few speedo type places and ask if they can build or know anyone who builds that kinda box then i'm sure u'll find him pretty easily...
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part of the newy conspiracy...
could the transfer case be th e problem any help would be greatly appreiciated 
